Description of problem:
/etc/sysconfig/network-scripts/ifup-alias does not check if an IP is already up
before assinging an IP to an alias interface
Version-Release number of selected component (if applicable):
initscripts-7.93.25.EL-1
How reproducible:
every time
Steps to Reproduce:
1. configure machine 1 with IP of 192.168.0.1 in ifcfg-eth0
2. configure machine 2 with any other IP in ifcfg-eth0 and IP Alias of
192.168.0.1 in ifcfg-eth0:0 :
DEVICE=eth0:0
ONPARENT=yes
IPADDR=192.168.0.1
NETMASK=255.255.255.0
3. Restart networking on machine 2
Actual results:
machine 2 will have eth0:0 with the same IP as eth0 on machine 2
Expected results:
Error, some other host already uses address 192.168.0.1
Additional info:
The arping code which is in /sbin/ifup is non-existent in
/etc/sysconfig/network-scripts/ifup-alias

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release. Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products. This request is not yet committed for inclusion in an Update
release.

This request was evaluated by Red Hat Engineering for inclusion in a Red
Hat Enterprise Linux maintenance release.
Red Hat does not currently plan to provide this change in a Red Hat Enterprise
Linux update release for currently deployed products.
With the goal of minimizing risk of change for deployed systems, and in
response to customer and partner requirements, Red Hat takes a conservative
approach when evaluating enhancements for inclusion in maintenance updates
for currently deployed products. The primary objectives of update releases
are to enable new hardware platform support and to resolve critical
defects.
However, Red Hat will further review this request for potential inclusion
in future major releases of Red Hat Enterprise Linux.